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remotely has become a priority. With an updated version of OWA, users have a rich email client that is approaching the full set of features and functionality found in Outlook 2003. However, some features are available only in the full Outlook client.

The good news is that with Exchange 2003 and RPC over HTTP, you can allow remote users to use the full Outlook 2003 client to access their email without setting up a VPN or other facility.

Remote Procedure Call (RPC) is one of the protocols that Exchange supports for client connections. To use RPC over HTTP, you need to configure one of your Exchange front-end servers to act as an RPC proxy server.

You can then expose this server to the outside world and allow users to connect through it. Alternatively, you can use Microsoft ISA Server to route requests through your firewall or perimeter network.

Your Outlook client is now ready to communicate with Exchange using RPC over HTTP.

WORKING WITH MICROSOFT ISA SERVER There are two critical areas where Microsoft ISA Server can be implemented alongside Exchange to increase security. The first is RPC over HTTP, which was already examined. You can place an ISA Server within the demilitarized zone (DMZ) or outside your firewall to handle RPC requests and route these requests back to your Exchange front-end servers.

Second, for securing OWA implementations, you can configure ISA as a proxy to an Exchange front-end server, eliminating the need to expose a front-end server to the rest of the world. Using ISA Server, you can use a special publishing wizard for OWA to configure a proxy to your Exchange front-end servers. This eliminates the need to open multiple ports to the outside world and provides a more secure implementation method for OWA.

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